Detection of solar activity signatures in OH* temperature fluctuations possibly related to the differential rotation of the Sun
Höppner, Kathrin and Bittner, Michael (2009) Detection of solar activity signatures in OH* temperature fluctuations possibly related to the differential rotation of the Sun. Journal of Atmospheric and Solar-Terrestrial Physics, 71, pp. 1287-1292. DOI: 10.1016/j.jastp.2009.04.008. ISSN 1364-6826.
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Measurements of the hydroxyl rotational temperatures at about 87 km altitude above Wuppertal (51.31N, 7.21E), Germany, are analysed. The time series covers the time interval from 1987 until 2005 and consists of more than 4000 night mean temperature data. Seasonal and longer-term trends are removed from the data set and OH* temperature fluctuations on temporal scales of about 3–40 days are derived. Various spectral analysis techniques (harmonic analysis, maximum entropy method and Wavelet transform) are applied. Can – due to the Sun’s rotation – the irregular pattern of sunspots on the solar disc lead to OH* temperature fluctuations? Pronounced spectral components in the OH* temperature fluctuations around a period from 27 to 31 days are frequently observed. We tentatively attribute these signatures to the differential rotation of the Sun: Sun’s equatorial regions rotate faster (taking only about 27 days) than the polar regions. Sunspots occur at heliographic latitudes at about ±40°, which correspond to a rotation rate of about 27–31 days. The OH* temperature fluctuations within this period range show a long-term modulation of 11 years. Thus, tracking the spectral intensity of the 27- to 31-day component should allow the indirect monitoring of the solar sunspot cycle.
|Title:||Detection of solar activity signatures in OH* temperature fluctuations possibly related to the differential rotation of the Sun|
|Journal or Publication Title:||Journal of Atmospheric and Solar-Terrestrial Physics|
|In Open Access:||No|
|In ISI Web of Science:||Yes|
|Page Range:||pp. 1287-1292|
|Keywords:||Hydroxyl airglow, Mesopause temperatures, Solar rotation, Sunspot cycle|
|HGF - Research field:||Aeronautics, Space and Transport|
|HGF - Program:||Space|
|HGF - Program Themes:||W EO - Erdbeobachtung|
|DLR - Research area:||Space|
|DLR - Program:||W EO - Erdbeobachtung|
|DLR - Research theme (Project):||W - Vorhaben Datenprodukte für Klima- und Atmosphärenanwendungen|
|Institutes and Institutions:||German Remote Sensing Data Center > Climate and Atmospheric Products|
|Deposited By:||Dr. Kathrin Höppner|
|Deposited On:||16 Nov 2009 10:09|
|Last Modified:||19 Apr 2013 08:48|
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